328 is a phenyl substituted benzotriazole UV absorber that provides good photostabilization protection for plastics and other organic substrates.
| Chemical name | 2-(2H-benzotriazole-2)-4,6-diphenylphenol |
| Molecular weight | 351.5g/mol |
| CAS | 25973-55-1 |
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328 is an efficient light stabilizer for a variety of plastics and organic substrates. It is recommended for homopolymer/ copolymer polystyrene, polyacrylate, unsaturated polyester, polyvinyl chloride, polyolefin, polyurethane, polycarbon, polyoxymethylene, polyvinyl butyral, elastomers and adhesives.
328 characteristics
Strong ultraviolet absorption capacity, light initial color, good compatibility with most materials, low volatility. Can protect polymers and organic pigments, maintain the original appearance and physical properties of molded products, films, fibers and sheets under outdoor use conditions.
Appearance
light yellow powder
Usage
Depending on the type of substrate and the performance requirements of the final product, the usage amount of 328 ranges from 0.1% to 1.0%. It can be used alone or in combination with other light stabilizers (such as hindered amines and conventional benzotriazole UV absorbers), antioxidants (such as hindered phenols, phosphites, sulfur-containing stabilizers, hydroxylamines, lactones), and other functional additives. When used in conjunction with hindered amine light stabilizers, 328 exhibits significant synergistic effects.
| Physicochemical Property | Melting range | 80-88℃ |
| Flash point | 229℃ | |
| Percentage (20℃) | 1.17g/cm3 | |
| Steam pressure (20℃) | 4.7 X 10-6Pa | |
| Solubility (20℃):%w/w | Water acetone 6 | |
| Benzene 39 | ||
| Chloroform 44 | ||
| Cyclohexane 15 | ||
| Ethyl acetate 16 | ||
| Hexane 16 | ||
| Methanol 0.4 | ||
| Chloromethane 56 |
At 328 nm, there is a characteristic strong absorption of ultraviolet light, and there is almost no absorption in the visible light region (> 400 nm). The maximum absorption peak of its dichloromethane solution is located at 306nm and 347nm (ε=14760 l/molcm)
Operational safety Operations should comply with chemical operation specifications, operate carefully, avoid unnecessary contact, maintain good ventilation. Avoid environmental pollution. Avoid dust, stay away from fire sources.
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